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Home > Science > Mathematics   »   what is the next number

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Old Apr 28, 2009, 11:01 PM
efi107
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what is the next number

what is the next number in this series?

1 , 2 , 6 , 42 , 1806 ...

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Old Apr 29, 2009, 12:53 AM   #2  
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2 possible answers are 3263442 and 3270666

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ANB428 agrees: How did you come up with those numbers? Can you explain to me? I am just wondering. Thanks!
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Old Apr 29, 2009, 10:00 AM   #3  
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I found that the next numbers have been multiplied by prime numbers... first;y by 2, then 3, then 7, then 43

and the answer of Cap, by 1807 and the other possibility, 1811 (which by the way is the next prime number)

3 is the 2rd prime number;
7 is the 3rd prime number including the 3rd prime;
but 43 isn't the 7th prime number after 7 inclusive... but the 11th..

That is quite confusing. Am I on the right track?
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Old Apr 29, 2009, 10:11 AM   #4  
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I found Capuchin's first value using this logic.



The second value is









I'm not sure of Capuchin's other possibility.

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Unknown008 agrees: Ah! Great! :)
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Old Apr 30, 2009, 03:15 AM   #5  
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Jerry, you're close to my logic, which was a(n) = a(n-1)*(next prime higher than a(n-1))

And Perito hit the logic behind my first answer,
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Old Apr 30, 2009, 07:08 AM   #6  
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Aha! Thanks Cap
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